[I-].[CH:2]([C:5]1[CH:10]=[C:9]([C:11]([F:14])([F:13])[F:12])[CH:8]=[CH:7][C:6]=1[C:15]1[O:16]CC(C)(C)[N+]=1C)([CH3:4])[CH3:3].[OH-:23].[Na+].Cl>CO>[CH:2]([C:5]1[CH:10]=[C:9]([C:11]([F:12])([F:13])[F:14])[CH:8]=[CH:7][C:6]=1[C:15]([OH:16])=[O:23])([CH3:3])[CH3:4]To a solution of 2-(2-isopropyl-4-trifluoromethyl-phenyl)-3,4,4-trimethyl-4,5-dihydro-oxazol-3-ium iodide (step 2) (1.26 g, 2.949 mmol) in 12 ml methanol were added 5N NaOH solution (11.8 ml, 58.98 mmol). The mixture was stirred in a 75° C. oil bath for 3 hours. The solution was cooled in an ice bath and acidified to pH 1 with a 5N HCl solution. The methanol was removed in vacuo. The suspension was stirred in an ice bath. The solid was filtered, washed with water and dried in vacuo to provide 618 mg (90%) of the title compound as a white solid. MS (m/e): 231.1 (M−H).
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